<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <style>
      * {
        margin: 0;
        padding: 0;
        box-sizing: border-box;
      }

      ul {
        list-style: none;
      }

      .mi {
        position: relative;
        width: 223px;
        margin: 100px auto;
      }

      .mi input {
        width: 223px;
        height: 48px;
        padding: 0 10px;
        font-size: 14px;
        line-height: 48px;
        border: 1px solid #e0e0e0;
        outline: none;
      }

      .mi .search {
        border: 1px solid #ff6700;
      }

      .result-list {
        position: absolute;
        left: 0;
        top: 48px;
        width: 223px;
        border: 1px solid #ff6700;
        border-top: 0;
        background: #fff;
        display: none;
      }

      .result-list a {
        display: block;
        padding: 6px 15px;
        font-size: 12px;
        color: #424242;
        text-decoration: none;
      }

      .result-list a:hover {
        background-color: #eee;
      }
    </style>
  </head>
  <body>
    <div class="mi">
      <input type="search" placeholder="小米笔记本" />
      <ul class="result-list">
        <li><a href="#">全部商品</a></li>
        <li><a href="#">小米11</a></li>
        <li><a href="#">小米10S</a></li>
        <li><a href="#">小米笔记本</a></li>
        <li><a href="#">小米手机</a></li>
        <li><a href="#">黑鲨4</a></li>
        <li><a href="#">空调</a></li>
      </ul>
    </div>

    <script>
    


    //获取元素
    const input=document.querySelector('input')
    const li=document.querySelector('.result-list')
    console.log(input);
    console.log(li);

    //绑定事件
    // 获取焦点然后显示隐藏的下拉框
    input.addEventListener('focus',function(){
      // 显示隐藏框
      li.style.display='block'
      // 追加一个类 触发时显示边框
      input.classList.add('search')
    })
    input.addEventListener('blur',function(){
      // 隐藏边框
      li.style.display='none'
      // 删除一个类 触发是删除边框
      input.classList.remove('search')
    })


    </script>
  </body>
</html>
